Explanation/Reference:
Explanation:
A: The - of the Active Column indicates that this boot environment is inactive, and hence not bootable.
Note: The values for the Active column are as follows:
R - Active on reboot.
N - Active now.
NR - Active now and active on reboot.
"-" - Inactive.
"!" - Unbootable boot environments in a non-global zone are represented by an exclamation point.
http://docs.oracle.com/cd/E23824_01/html/E21801/unbootable.html#scrolltoc

The prtconf command prints the system configuration informa-tion. The output includes the total amount of memory,and the configuration of system peripherals formatted as a dev-ice tree.
If a device path is specified on the command line for those command options that can take a device path,prtconf will only display information for that device node.

From the output exhibit we can deduce that the shell has id 15156.
It has spawned three subprocesses:
grep: id 15166
ps -aef 15165
The remaining 15163 must be the subshell (see note below).
This is the id of the process which should be terminated.
Reference: man ps
Note: The command ~/bigscript & starts ~/bigscript in a separate subshell.
Echo $ displays the exit status of a command.

The Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet Protocol Suite. ICMP differs from transport protocols such as TCP and UDP in that it is not typically used to exchange data between systems, nor is it regularly employed by end-user network applications
(with the exception of some diagnostic tools like ping and traceroute).

Explanation/Reference:
Explanation: